They aren't quite interchangeable. Both are used in the test suite, with no indication of why one or the other. I think we'd be best off being consistent. Based on the names, I think `_calculateFormulaValue` was intended as a private, or at least internal, method, so favor `calculateFormula`. I do not intend to rename or re-categorize `_calculateFormulaValue`, just remove its usage when it isn't clearly warranted.
Fix#3941. Html and Pdf Writers will show PrintArea if specified rather than the entire sheet. Html Writer, which needs to handle both screen and print views, will use PrintArea through CSS; PDF, which needs to handle only print view, will use it by not including rows and columns which are not in the PrintArea. The support is limited because:
- PrintArea can consist of several different ranges. The writers will use the PrintArea only if it consists of a single range.
- Html use will be effective only if `useInlineCSS` is set to `false`, which is its default value.
- Other aspects of page setup, e.g. horizontal centered, remain unsupported, with or without PrintArea.
Html Writer will also set a `data-printarea` attribute on the `table` declaration for a worksheet when appropriate. Html Reader will recognize and process that attribute. This usage does not require that the PrintArea consist of a single range.
Fix#4695. PhpSpreadsheet has assumed that each Protected Range on a Worksheet is defined in the Xml using a single range. However, Excel itself will often combine ranges together. So, in the xml for the spreadsheet supplied with the issue, we see:
```xml
<protectedRange name="Champs_non_bloqués_2" sqref="B2:D4 J2:L4 F2:H4"/>
```
When inserting or deleting rows or columns, ReferenceHelper is used to adjust (among other things) Protected Ranges. The existing code (probably) works well enough if there is only one range in `sqref`, but fails to parse correctly and throws an Exception when there is more than one. It is replaced with a fairly straightforward manner of updating when rows/columns are inserted, and a slightly more convoluted manner of updating when rows/columns are deleted.
oleibman
Robin van der Vliet